CANADA STOCKS-Weak oil prices weigh on futures

July 28 (Reuters) - Canada’s main stock index was set to open lower on Thursday as oil prices slipped to 3-month lows a day after data showed a surprise rise in U.S. crude and gasoline inventories.

The build added to an already huge glut of global refined products just as slowing economic growth dents outlook on demand.

September futures on the S&P TSX index were down 0.07 percent at 7:30 a.m. ET.

Canada’s main stock index closed barely lower on Wednesday, hurt by losses in energy shares as oil prices slid on a surprise inventory build, which offset the impact of positive comments from the U.S. Federal Reserve.

No major Canadian data is scheduled for release on Thursday.

Dow Jones Industrial Average e-mini futures were down 0.02 percent at 7:30 a.m. ET, while S&P 500 e-mini futures were up 0.01 percent and Nasdaq 100 e-mini futures were down 0.01 percent.

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Potash Corp of Saskatchewan , the world’s biggest fertilizer company by capacity, cut its full-year profit forecast for the second time, but said potash markets had reached their low point.

Canadian miner Teck Resources Ltd reported a surprise quarterly profit as its costs declined. Teck, the largest producer of steelmaking coal in North America, said operating costs fell 15 percent to C$691 million ($525 million) in the second quarter.

Cenovus Energy Inc posted a smaller-than-expected quarterly loss, helped by its cost reduction efforts, and said about two-thirds of the costs it had cut since 2014-end would be “sustainable” even when oil prices recover.